nameserver/cache problem

[Johnp]

Name Server / Cache Problems

Might be a silly post, but one of the previous replies eluded to it perhaps being at the ISP end.

If your ISP uses a 'transparent cache' for all port 80 traffic, e.g. as per ex. NTL / Blueyonder cable customers then you often get a problem with updates you have made to your own web sites not being visable for some time.

Where a confusion can arise is if at some point you have manually set a different proxy server on one of the machines, which I have to say I regularly need to to do as probably 2/3 times a week the default proxy server just won't access some sites e.g. Sedo.com or any of their parked pages. What you then get is one of the machines seeing the new page but perhaps the machine you updated the pages from still seeing the old pages.

If this helps at all then great- otherwise perhaps worth mentioning as this has caused me and sure will continue to cause others a few headaches.


Best Regards



JohnP

 

[SF]

I have had similar problems before but was always told that once you update the dns its not accessible all over the world until atleast 48 hours... so half the world might see the new site but the rest might not...

I dont think its much more complicated than that

 

[grantw]

I have had similar problems before but was always told that once you update the dns its not accessible all over the world until atleast 48 hours... so half the world might see the new site but the rest might not...

I dont think its much more complicated than that

Indeed, but one PC in my house can see the updated site and the other PC can't, both PCs are sharing the same internet connection?

Grant

 

[SF]

Yeah understand what you are saying ... but if you left the old pc for 48 hours from now it should work shouldnt it

 

[domainking]

ips problem

Yes sounds link an ISP problem

 

[retired_member16]

.....................

 

[Johnp]

DNS Changes

Re my earlier post.

Had the same problem myself this evening, one machine that was powered up all day - still seeing the old site, laptop just switched on seeing the new one. A quick check via a 'dos box ping' command proved that different IP addresses being returned for the same site, so nothing to do with the ISP, IE or firefox etc.

After a shutdown of the machine that had been left on all day, it came up now seeing the site on it's new hosting service. Suspect that the DNS cache on the network connection had not been flushed probably a windows XP 'repair' of the network connection would have had the same effect.

Hope that helps.

Best Regards


JohnP

 

[grantw]

Thanks for all the replies on this, the sites are now working fine and domains I've worked on since have not had the same issue....

Grant